I’ve used fluoxetine with 2 different dogs for anxiety during our Oklahoma severe weather of intense lightning & thunderstorms. It seems to help them but their symptoms do not completely disappear under the medication. On the larger dog, an Australian cattle dog now gone for over 10 years, we also tried one of those compression snuggle wraps to some good effect. As to the dogs merely mirroring owner anxiety, that may apply in some cases but not this one. My wife & I are both well aware about storms & I even do some storm spotting for the local weather service office, reporting via amateur radio.